Eric h



tui-teh tats; jsttnt fitte.

OLIVER E. PlIlLAR-D, OF `NE W BRITAIN, GONNEOTIOUTASSIGNOR TO FRED- ERICH. NORTH, OF SAME PLACE.

Letters Patent No. 79,388, dated June' 30, 1868.

IMPROVEMENT IN PERMTATION-LOGKS-.

TO ALL WHOM IT LNIAY'CONCERN:

Be it known that I, OLIVER E. PILLARD, of New Britain, in'the lcountyoi' Hartford, andState of Connectiout, have invented, made, and appliedtonse, a certain new and useful Improvement in Locks and I do herebydeclare the following to bea full, clear, and exact description of thesaid invention, reference being had to the annexed drawing, making partof this specification, whereini v Figure 1 is an elevation of the lock,the back plate and circnlar-tumblers being removed.

Figure 2 is a section of the lock at the spindle, and l Figure 3 is asimilar sectin, in larger size, of the disk `andring atthe end of thespindle.

Similar marks of reference denote the sameparts.

The object of my invention is toprevent any indication of the positionof the interior parts by a movement of the knob and spindle in anydirection, and thus render it impossible to tell, byfeeling, whentheparts are properly placed for opening the lock.

Heretofore an inclined end to the spindle has been employed to -raisethe dog that acts between-the tumbler andbolt, but that incline allowedoi' a'measurement being taken ofrthe relative position of the dog and lincline, according to the extent et' end motion of the spindle. Y

The nature of my said invention consists in an'irregular circularincline or truncated cone at the end of the spindle, for raising thedog, so as to prevent reliability in the measurements of any endmovement, and thus increase the diculty in picking the lock.

And I make this truncated con-e as a loose ring, that may be turned withthe spindle, or be stopped by the contact therewith of the dog, whilethe spindle continues to be turned, and thus prevent measurements beingtaken at one definite pnint todetermine ,the position ofthe'dog'relatively to the tumblers.

vI combine, with this conical ring and dog, a ring that hangs fromthedog, and prevents the spindle engaging with the belt until thetumbler-s are all properly placed.

In the drawing, a is the lock-case, the bolt, e the spindle d the indexand handle, and e Athe circular tumbler to be set separately and insuccession. These parts are to he of any desired character,.and,rbeingwell known, do not require further description. l

`fis the dog on the fulcrum g, taking the stop z'. On the'bolt k isafootto the'dog f.

The periphery'of the incline or truncated cone n, at the end of the'spindle c, may be circular orundulating. I have shown the same ascirculan-with an undulating disk :e between the hub s and ring n, saiddisk being :fixed to and moving withythe hub s. The irregular shape ofthe periphery ofthe disk ze, as seen at the points 1 and 2, utterlyderangcs anyebrt to effect a measurement to determine any of thepositions of Athe parts by an end motion of the spindle or otherwise,and the 'ring n will turn with the spindle `whenthe dog is raisedby oneof the projections 2', and be stoppedby the Contact ofthe dog with itsedge.

The incline n, at the end of the spindle, is not regular, being fulleron one side than on the otl1er,`as seen in larger size in iig.- 3, sothat if the dog is dropped by drawing the ring n from under the foot k,andthe stud o rests upon the edges ofthe tumblers,any measurement of theposition of thatA dog, by reason ofthe end motion allowed to saidVspindle to the point of contact of n and lc, would be valueless inefforts to pick the lock,

because ofthe irregularity ofthe cone or inelinen; and as an additionalsecurity, the' conical ring n is loose, so l as to be stopped by thecontactA therewith ofthe footc, and hence' the position oftheirregularities of that cone to the dial; will be varied by thespindlebeing turned while the ring is stationary.

The bplt is moved by' the teeth 3 on the hub sk taking the teeth 4 onthe bolt, but these parts cannot be brought into contact until thecoinciding of the notches in the tumblers e-allows the dog f to fall,and move down with it the ring r, that has an opening just large enoughto admit said hub s to be drawn back into it as the teeth 3 and 4 engagetogether. l'

What I claim, and desire to secure by Letters Patent, is-

1. The incline n at the inner end of the spindle, with an irregularsurface, in combination with the dogf, and series of Itumblers e, as andfor the purposes setforth.

2.`The ring n, tted loosely upon the inner end of the spindle, so thatit may be stopped by conizact with .the dogf, as and for the purposesset forth. l

3. The disk x, withan irregular periphery, in combination with thespindle c and incline n, substantially as and for the purposesspecified.

In witness whereof,'I have hereunto set; my signature, this thirteth dayof November, A. D. 1867.

OLIVER E. PILLARD.

Witnesses:

Y HENRY NASH,

JOSEPH D. AMEN.

